cppdraft_translate/cppdraft/ios/fmtflags.md

[ios.fmtflags]

31 Input/output library [input.output]

31.5 Iostreams base classes [iostreams.base]

31.5.2 Class ios_base [ios.base]

31.5.2.2 Types [ios.types]

31.5.2.2.2 Type ios_base​::​fmtflags [ios.fmtflags]

🔗

using fmtflags = T1;

1

#

The typefmtflags is a bitmask type ([bitmask.types]).

Setting its elements has the effects indicated in Table 136.

Table 136 — fmtflags effects [tab:ios.fmtflags]

🔗 Element	Effect(s) if set
🔗 boolalpha	insert and extract bool type in alphabetic format
🔗 dec	converts integer input or generates integer output in decimal base
🔗 fixed	generate floating-point output in fixed-point notation
🔗 hex	converts integer input or generates integer output in hexadecimal base
🔗 internal	adds fill characters at a designated internal point in certain generated output, or identical to right if no such point is designated
🔗 left	adds fill characters on the right (final positions) of certain generated output
🔗 oct	converts integer input or generates integer output in octal base
🔗 right	adds fill characters on the left (initial positions) of certain generated output
🔗 scientific	generates floating-point output in scientific notation
🔗 showbase	generates a prefix indicating the numeric base of generated integer output
🔗 showpoint	generates a decimal-point character unconditionally in generated floating-point output
🔗 showpos	generates a + sign in non-negative generated numeric output
🔗 skipws	skips leading whitespace before certain input operations
🔗 unitbuf	flushes output after each output operation
🔗 uppercase	replaces certain lowercase letters with their uppercase equivalents in generated output

2

#

Typefmtflags also defines the constants indicated in Table 137.

Table 137 — fmtflags constants [tab:ios.fmtflags.const]

🔗 Constant	Allowable values
🔗 adjustfield	left
🔗 basefield	dec
🔗 floatfield	scientific